Drawing frame



Dec. 11, 1928. 1,694,510

H. KLUFTINGER DRAWING FRAME Filed June 23, 1927 E191 Fig, 2

H qn n KLu FTI EEK INVENTOR Patented were. ill, llfififi.

insane HERMANN KLUFTINGER, OF KEMPTEN, GERMANY.

DRAWING FRAME.

Application filed .Tune 23, 1927, Serial No.

For some kinds of textile fibres, for example cotton, wool and silk, drawing frames are used, wherein the distance between successive pairs of rollers is less than the length of the fibres, the upper roller of the slower pair being sufliciently light to avoid undue risk of tearing the fibres. This upper roller may be solid, of light material, or it may be hollow". Iwo main difiiculties occur in frames of 'this kind. Firstly, the fibres under draft by the faster rollers, and moving with a velocity equal to the surface velocity of those rollers, accelerate the light top roller under which they are passing so that the surface velocity of this light roller differs from that of the fluted roller with which it coacts, and is liable to be irregular, the velocity varying with the number of fibres which are under draft at any given time, and with the friction between them and the rollers. Secondly, the conditions vary considerably with different kinds of fibres. Long staple fibres, owing to their larger area of contact, adhere to each other better than short staple fibres. Coarse, dense slivers are more difficult to draw than the looser kinds. The fibre friction within the sliver varies also with the twist of the fibres, and with the smoothness and degree of moisture. Consequently the drag exerted by the fibres under draft on the fibres not yet engaged is apt to vary considerably. All these circumstances have to be taken into consideration, and provided for, for the purpose of securing uniform slivers. 'I'he friction between the fibres, whereby those which are moving faster drag the others along, must be so regulated that uniform numbers of fibres pass through the frame per unit of time.

The usual method has been to make the pressure on the fibres suficiently large to prevent slip between the rollers. Variable loading of the upper rollers has in some cases been provided for, but only for the purpose of regulating the pressure to secure this absence of slip with different classes of sliver. To meet variations in the condition and quality of particular classes of fibre the distances between the rollers have been varied, so as to var the number of fibres which passes throng With intensive drawing, where a particular, small distance between the rollers must be maintained, this method of varying the distance is not available, and varia- 200.840, and in Germany August 3, 1926.

tions in the nature of the fibre can only be provided for by increasing or reducing the pressure on the fibre between the rollers.

It has been proposed to meet the ditliculties hereinbefore set forth, by arranging that the Weight of the upper roller can be varied,

by using rollers of different diameters, or rollers of different specific gravities, or by filling a hollow roller to varying degrees. For this purpose numerous rollers must be kept available, or a somewhat difficult and slow operation of filling or emptying is required. This occupies much time, and even so only an approximation to the required conditions of loading can be obtained, so that this method has not achieved success in prac- Figs. 1 to 3 show one embodiment thereof,

Fig. 1 being a sectional elevation, Fig. 2 a plan view, and Fig. 3 a view of a detail. showing the front end of the roller loading lever, as seen from the right side of Figure 1.

Fig. 4 shows mechanism for collectively 5' regulating the load on all the intermediate rollers of a machine. j

Fig. 5 shows another embodiment of the invention.

Referring first to Figs. 1 to 3, the three pairs of rollers 22, 3 and 4 are mounted in a frame 1, the intermediate pair 3 being under variable pressure. For this purpose a double armed lever 6 is rotatably mounted on a shaft 5, and one of its arms terminates in two sharp edges 7 resting on the top roller 3 belonging to the intermediate pair 3. Its other lever arm forms a balancing tail 8, so that the lever 6 itself exerts no pressure on the roller 3' by virtue of its own weight. It can, however, be 10 loaded by means of a weight 9 integral with two arms 10, which are pivoted at 12 to arms 11 keyed on the shaft 5, so that the osition of the weight 9 on the lever 6, an consequently the efiective loading of that lever, can

be varied by rotating the shaft 5. In the position marked I in Fig. 1 the load is at its maximum. In the posltion marked II, indicated by broken lines, the centre of gravity of the weight 9 is vertically above the pivotal axis of the lever 6, and the load is nil.

To allow of removing the rollers when required the weight 9 is swung about the axis 12 from the position I through position III to position IV, its tip describing a circular are 11, and then the lever 6 is swung about the shaft 5 from the position V to the position of rest VI, so that it describes a circular are 15.

Where this loading device is applied to all the intermediate rollers on one side of the machine the weight levers may be mounted, by means of arms 11 on a common shaft 5, so that for' e'ach side of the machine regulation of the load on all the intermediate rollers on that side may be effected by rotating a single shaft.

Fig. 4 shows a modification in which shafts 5 and 5 at the two sides of the machine are controlled by a common actuating device. Vorms 2'0 and 21 are fixed to a shaft 16, which can be rotated by means of bevel wheels 17 and 18 and a hand wheel 19, the worms acting on the shafts 5 and 5 by means of the worm wheels 22 and 23. The worm trans mission is self-locking so that the weights 9 are held securely in whatever position is required. The shafts 5 and 5 carry pointers 24; and 25 respectively, which move in front of scales 26 and 27 and indicate the positions of the weights 9 and the load on the rollers. The hand wheel 19 is preferably made readily detachable, and is only placed on its spindle when required for altering the loading of the rollers.

In the modification shown in Fig. 5 the lever 6 is loaded by a spring 28, which can be regulated b rotating a cam 29 on a cam shaft 30. All the cams for one side of the machine may be arranged on a common shaft 30, and the shaft 30 may have a single actuating device like that shown in Fi 4.

In addition to allowing of very speedy and accurate regulation of the load on the rollers the device has the advantage of steadying the light top rollers and preventing variations of the speed thereof due to vibration or flutter- ,7

What I claim as my invention and desire to passed; a balanced pressure lever bearing on one of the rollers of an intermediate pair and means for regulating the load on the said balanced pressure lever.

p 2. In drawing frames for textile fibres, the combination of three pairs of rollers arranged in close relation, the one after the other, a balanced lever bearing on the top roller of the intermediate pair of rollers, and means including a turnable shaft for imposing a regulatable load on the said balanced lever.

3. In drawing frames for textile fibres the combination of three pairs of rollers arranged in close relation, the one after the other, a balanced lever bearing on the top roller of the intermediate pair of rollers, a turnable shaft having an arm fixed thereto, a weighted lever hinged at the free end of the said arm and bearing with its free end on the said balanced lever.

l. In drawing frames for textile fibres the combination of a pluralit of pairs of rollers through which the stran or thread of fibres is passed, a system of pressure levers bearing on one of the rollers of an intermediate pair, and a device for indicating the load imposed by the pressure levers on the said pressed roller.

5. A machine, comprising two series of drawing frames, as claimed in claim 1 in combination with common means for both series for adjusting simultaneously the pressure levers in the different drawing frames.

6. A machine, comprising two series of drawing frames, as claimed in claim 1, in combination with worm gears connected with each one of the two series of drawing frames, a common shaft connected to the two worm gears, and means including a hand-Wheel for adjusting the said common shaft.

In witness whereof I have signed this specification.

HERMANN' KLUFTINGER. 

